Ore-grinding machine.



G. R. HOTGHKISS. 011B GRINDING MACHINE. APPLICATION FILED JA;N 21. 1909.

964,024, Patented Ju1y12,1'910.

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@invento-a CHARLES R. HOTCI-IKISS, 0F OAKLAND, CALIFORNIA, ASSIGNOR OFONE-HALF TO GEORGE S. MONTGOMERY, OF OAKLAND, CALIFORNIA.

ORE-GRINDING MACHINE.

Specification of Letters Patent.

Patented July 12, 1910.

Original application filed October 17, 1908, Serial No. 458,222. Dividedand this application led January 21, 1909. Serial No. 473,431.

To all whom it may concern:

Be it known that I, CHARLES R. I-IoroH- nrss, citizen of the UnitedStates, residing at Oakland, in the county of Alameda and State ofCalifornia, have invented certain new and useful Improvements inOre-Grinding l/lachines, of which the following is a specification,reference being had therein to the accompanying drawing.

This invention relates to ore grinding machines adapted for use inconjunction with the amalgamator shown and described in my applicationfor Letters Patent, Serial ,iL-458,222, filed Oct. 17, 1908, and ofwhich the present application is a division.

rIhe object of the invention is to provide an improved device for moreeffectually reducing ores to the consistency of pulp or sliines, andprovide for a novel trituration and separation of the gold or silver,which is so frequently in a state of dissemination, in the ores.

To the accomplishment of the recited object and others coordinatetherewith, the preferred embodiment of the invention resides in thatconstruction and arrangement of parts hereinafter described, illustratedin the accompanying drawings and embraced within the scope of theappended claim.

In said drawings Figure 1 is a vertical sectional elevation of theapparatus, and Fig. 2 is a top plan View thereof, a portion being brokenaway to more clearly show the arrangement o-f the rollers.

Like reference characters designate corresponding parts throughout theseveral views.

Referring more particularly to the drawings fora detailed description ofmy invention, the numeral 5 designates the lower grinding cone which issuitably supported upon the upper proximal ends of the stand ards 6 bythe integrally formed, laterally projecting members 7. This grindingcone 5 is provided with a plurality of rows of grinding faces 8,arranged in stepped relation and equipped with an inclined bed plate 9,the latter having a medially arranged depending' projection 10 whichengages the complementary recess 11 in such manner as to lock andpreclude any lateral displacement of said bed plate with respect to therollers, which will be presently described.

In conjunction with the aforesaid mechanism I employ an upper grindingcone 12, the same being correlative with the lower or subgrinding cone 5and obviously having step-like faces and the bed plates. Intermediatethe bed plates of the respective cones are mounted a plurality ofsubstantially frusto-conical shaped rollers 13, which are devised toassist in the trituration of the ores in a more effectual manner thanthe spherical ore Crushers, which are at the present time in common usein devices of this char acter. It will be noted in this connection thatthe upper bed-plates, as well as the rollers, below the top step are ofless transverse extent than the corresponding elements contained withinthe topmost step in order to form spaces for the passage of the ore fromstep to step.

Adjacent the edge of the upper surface of the lower cone 5 is an angulartrough 14 in which works the adjustable scrapers 15 carried by thecorresponding portion of the upper cone l2 and adapted to agitate thepulp which is precipitated in the trough and discharge the same throughthe converging pipes 16 which empty into the hopper of the amalgamator,not shown.

A hopper 1T is seated on the upper surface of the cone 12 so as to be incommunication with the ore feeding chute 18, and arranged to deliver thematerial to the upper series of grinding rollers through a centralopening 19 formed in said upper cone. rIhe upper outer edge portion ofsaid cone 12 is equipped with a circular, toothed track 20 with which apinion 21 engages, said pinion being carried by a power shaft 22, havingmounted thereon a pulley 23 which is connected with a suitable source ofpower, not shown.

The upper cone 12 is loose on the shaft 24C and has a bracket 25carrying a collar 26 surrounding the said shaft and presenting a fullupper surface upon which a row of ball bearings 2T are seated, and saidshaft has a ball race 28 above said bearings, the flat upper surface ofwhich forms a seat for the coil spring 29. The upper end of this springabuts a similar ball race 30 which forms a seat for another series ofball bearings 31, above which said shaft is threaded for the receptionof the tension nut 32. It will be seen that by adjusting the nut 32 onthe shaft the desired pressure of the upper cone l2 upon the grindingrollers 13 may be had.

The operation of the device is as follows: Ore is shot in through thechute 18 into the hopper 17, thence through the central opening 19 intothe upper cone 12 into the grinding rollers 13, and after traversing thevarious series of stepped grinding surfaces, it is delivered-in pulpform into the trough 14, it being understood, that the said upper conehas imparted thereto a rotary movement through the medium of the track20 and pinion 21. The Scrapers 15 carried by the upper cone force thematerial through said trough and cause it to ow through the dischargepipes 16 and obviously into the amalgamator.

Having thus described the invention, what is claimed as new, is

An ore grinding machine comprising a pair of nested cones, the uppercone being rotatable and the lower Xed, the meeting faces' of 'saidcones being arranged in annular stepped formation, each upper and lowerstep having a bed plate with an inclined surface, the upper bed platebeing of less width than the lower bed plate, rows ofannularly-arranged, rustoeconical grinding rollers located between saidbed plates, thek several rows of rollers being contiguous to each otherand each roller having its smaller end in alinement with the inner endof the upper bed plate whereby a vertical passageway is formed betweeneach row of rollers for the passage of the material being ground, and anannular trough located adjacent to and below the lowest row of rollersand pro vided with discharge outlets.

'In testimony whereof I hereunto aiitix my signature in presence of twowitnesses.

CHARLES R. HOTCHKISS.

Vitnesses:

H. C. SGHROEDER, F. P. SCHROEDER.

